Non-resonant gearing.



A. SUNDH.

NON-RESONANT GEARING.

APPLICATION FILED NOV. 16, 1911.

Ififented June 6,1916.

ATTORIV y UNITED STATES PATENT OFFICE.

AUGUST SUNDH, OF HASTINGS-UPON-HUDSON, .NEW YORK, ASSIG-NOR TO OTIS' I ELEVATOR COMPANY, A CORPORATION OF NEW JERSEY.

noN-REsoNANr GEARING.

Specification of Letters Patent. Patented June 6, 1916.

Application filed November 16, 1911. Serial No. 660,627.

To all whom it may concern Be it known that I, AUGUST SUNDH, a citi- Zen of the United States, residing at Hastings-upon-I-Iudson, in the county of West chester andState of New York, have invent ed a new and useful Improvement in Non- Resonant Gearing, of which the following is a specification. My invention relates to non-resonant gear- 1ng. The primary object of the invention is to produce gears that are non-resonant or which will not transmit the sound vibrations as do the usual forms of gears. By the use of my invention, the noise of operation of spur gears and other, forms of gearing may be greatly reduced or practically eliminated. Referring to the accompanying drawings which illustrate various forms of gear wheels or power transmitting devices,-Figure 1 is a view partly .in section of intermeshing spur gear wheels constructed in accordance with my invention, and ,also showing a means for filling the hollow gear wheels with a suitable liquid; Fig. 2 is a transverse sectional viewof a gear wheel; Fig. 3 shows a worm wheel and worm constructed in accordance with my invention; Fig. 4 shows a train of'friction gearing.

Referring particularly to Figs. 1 and 2,

a spur gear wheel 1 is provided with the usual spur gear teeth 3, and may be keyed to a shaft 4 in the usual way. The gear wheel is made hollow to receive a liquid or mobile substance 5, such "as oil, water, Vaseline, etc. The chamber containing the liquid 5 preferably completely surrounds the hub 6 of the wheel, and, as shown in Fig. 2, may comprise two or more compartments 7, 8, in communication throughopenings 9 formed in the wall or partition 10 which separates said compartments. The liquid or filling material is injected through an open ing which is normally closed by a plug ll. As shown in Fig. 1 a pump P may be employed to force the liquid into the gear. The liquid or semi-liquid material within the gear is preferably placed under compression.- The plug .11 serves not only to prevent the escape of liquid, but as a means of applying and adjustably varying the pressure. As shown in Fig. 2 the plug 11 is somewhat longer than the thickness of the wall of the gear, therebypermitting the plug to be -on said'substance.

screwed inward sufliciently to place any desired degree of pressure on theinclosed material. The liquid or like substance within thegear acts to absorb or prevent sound vibrations being transmitted through the gear wall, and thereby greatly reduces or practlcally eliminates the noise which is always present in the operation of the'ordi-,

nary forms of spur gearing. As shown in Fig. 1 a spur pinion 2 is in mesh with thegear wheel 1. The construction of, this pinion is substantially the same as that described in connection withthe gear 1.

In Fig. 3 is shown a'worm gear'wheel 12 which runs in mesh with a worm 13 formed 1 on the worm shaft 14. The internal structure of the wheel 12 is the same as that of the gear wheel already described. The worm shaft is also made hollow or formed with a chamber 15 filled with the liquid 5. A passage 16 extends from they chamber 15 to the end of the shaft and is closed with an adjustable plug 11.

Fig. 4 illustrates a train of friction gears comprising a central friction wheel 17, wheels or rollers 18 in frictional rolling contact therewith, and an'annular member 19 surrounding and in frictional rolling contact with the rollers 18. Each of these friction elements is made hollow or formed with a chamber to receive the material 5, and each is provided with a plug llfor adjusting and maintaining the internal pressure.

It will be understood that the present invention is applicable to other forms of gears or power transmitting elements than those herein shown. Various means other than those herein disclosed might also be employed for maintaining pressure on the liquid or filling material. Various other modi- 1. In combination, a power transmitting element formed with an internal space of fixed volume, a mobile substance filling said space, and means for maintaining pressure for said opening adjustable to vary the pressure on said liquid.

4. The combination of a hollow power transmitting element formed With an intake opening, a filling liquid under compression Within said element, and a plug adjustable in said opening. I

5. As an article of manufacture, a gear Wheel comprising anouter shell forming a chamber of fixed volume, a filling of non resonant material under pressure, and means to adjust said pressure.

In testimony whereof, I have signed my name to thls specification in the presence of two subscribing itnesses.

AUGUST SUNDH.

Witnesses: F JAMES G. BETHELL, J. 11?. Row. 

